Replacement for the failed LDV system at University of Windsor

为了正确地模拟内部和外部流动，需要对速度和湍流进行测量。这些流动包括河流中的流动、废水排放、通过建筑物的流动等。在大多数情况下，这些流动是三维的和湍流的，这意味着混合很大程度上是由于流体的小尺度混沌行为，其中速度场在空间和时间上变化。在许多应用中，对这些流动和相关传输现象进行建模的能力是至关重要的。温莎大学正在进行上述领域的研究，并在过去15年中使用激光多普勒测速仪系统作出了重大贡献。从激光测速系统获得的速度数据为复杂流场计算模型的补充验证提供了有价值的信息。LDV是许多研究生论文中使用的主要工具。温莎大学的LDV系统是2003年购买的。它是我们的主力，大量HQP接受了超过15年的系统使用培训。目前，由于系统的完全退化，激光雷达系统已经过时。风冷激光器在2006年和2009年曾两次更换，现已不再运行。2012年，在经过十年的广泛使用后，该软件进行了更新，以符合较新的计算机操作系统。现在，缺乏与现代计算机操作系统兼容的硬件组件也成为一个问题。多年来，光缆已经退化，用于提取数据的处理器也已不复存在。制造商表示，没有可替换的部件，如果有的话，有些部件非常昂贵。我们前两次与激光测速系统有关的RTI申请没有得到资助，资金需求怎么强调都不为过。*要求提供拟议的设备赠款，以支持更换现已废弃的激光测速系统。正在为一种新的激光测速系统寻求资金，该系统能够分辨两个速度分量，并便于在空气和水中进行测量。由于我们两个系的学生需要LDV功能，因此迫切需要购买该系统。激光测速技术的应用对于研究自由表面流动、三维射流、尾迹和流固耦合的湍流结构具有重要意义。在不久的将来，该设备将用于下列项目：自曝气自由表面流动的实验研究(2 PhD，2 MASc)；扑翼/弯曲结构之间的能量交换(2 MASc)；冲刷研究(1 PDF)；冲击射流的冷却应用(1 PhD)；明渠河床粗糙度(1 Phd)。与过去一样，进行上述研究的能力将增强我们从温莎的工业研究伙伴那里获得额外资金的能力。

Measurements of velocity and turbulence are required to properly model both internal and external flows. These include flow in rivers, effluent discharge of wastewater, flow past buildings, etc. In most cases, these flows are three dimensional and turbulent, which means the mixing is largely due to small scale chaotic behaviour of the fluid where the velocity fields are varying in space and time. The ability to model these flows and the associated transport phenomena is of critical importance in many applications. Research in the above areas is in progress at the University of Windsor and significant contributions have been made over the last 15 years using a laser Doppler Velocimeter (LDV) system. Velocity data acquired from the LDV system have provided valuable information for complementary validation of computational models of complex flow fields. The LDV was the principal tool used in many graduate theses.******The LDV system at University of Windsor was purchased in 2003. It was our workhorse and a large number of HQP were trained in the use of the system for over 15 years. Currently the LDV system is obsolete due to the complete deterioration of the system. The air-cooled laser has been replaced twice in the past in 2006 and 2009, and is no longer in operation. In 2012, after a decade of extensive usage, the software was updated to comply with the newer computer operating system. Now the lack of availability of hardware components compatible with modern computer operating systems has also become an issue. Over the years, the fiber optic cables have deteriorated and the processor used to extract the data has perished. The manufacturer has indicated that replacement parts are not available and some of the parts, if available are very expensive. Our previous two RTI applications related to the LDV were not funded and the need for funding cannot be over-emphasized.******The proposed equipment grant is requested to support the replacement of the now defunct LDV system. Funds are sought for a new LDV system that is capable of resolving two velocity components and facilitate measurements in air and water. There is an immediate need for purchasing this system as our students from two departments need the LDV capability. Availability of the LDV technology is critically important in the investigation of turbulence structure of free surface flows, 3D jets, wakes and fluid-structure interaction. In the immediate future, the equipment will be used in the following projects: Experimental study of self-aerated free surface flows (2 PhD, 2 MASc); energy exchange between flapping/bending structures (2 MASc); scour studies (1 PDF); cooling applications of impinging jets (1 PhD); bed roughness in open channels (1 PhD). As in the past, the capability to conduct the above studies will enhance our ability to procure additional funding from industrial research partners in Windsor.*****